Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9147288 | Subdivision of surfaces approximation | Eric Johnston | 2015-09-29 |
| 6741080 | Buffered ion sense current source in an ignition coil | Philip Allen Karau, Scott B. Kesler | 2004-05-25 |
| 6498490 | Ion sense ignition bias circuit | Philip Allen Karau | 2002-12-24 |
| 5219228 | Exhaust gas temperature measuring system utilizing existing oxygen sensor | Eric Ker | 1993-06-15 |
| 4914384 | Magnetic gage driver circuit | David W. Taylor, Arthur C. Kovacic | 1990-04-03 |